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Plant and Cell Physiology, 1974, Vol. 15, No. 2 225-238
© 1974

Article

Effects of growth temperature on photosynthetic carbon metabolism in green plants II. Photsoynthetic 14CO2-incorporation in plants acclimatized to varied temperatures1

Shin-ichi Sawada2 and Shigetoh Miyachi

Institute of Applied Microbiology, University of Tokyo Tokyo, Japan

During photosynthetic 14CO2-fixation, leaves of plants such as wheat, the broad bean and spinach, which had been acclimatized to high temperature (20–25°C), incorporated much more radioactivity into sucrose, and less into glycine and serine in comparison with similar plants grown in the cold (mean temperature, 5–7°C).

Radioactivities incorporated into glycine and serine greatly descreased on the addition of {alpha}-hydroxyethylsulfonate or on the removal of oxygen from the atmosphere, indicating that these compounds are synthesized through the glycolate pathway.

In leaves of wheat grown under low temperatures, relatively high radioactivity was detected in ribulose 1,5-diphosphate among the photosynthetic 14CO2-fixation products, whereas practically no radioactivity was detected in this compound in leaves of wheat which had been acclimatized to high temperatures. We assumed that the carboxylation reaction of ribulose 1,5-diphosphate is suppressed in plants acclimatized to low temperatures.

It was further inferred that the C-2 and C-2 moiety of ribulose 1,5-diphosphate accumulating as a result of suppression of carboxylation is converted to glycine and serine through the glycolate pathway.

The possibility was also discussed that during photosynthetic CO2-fixation in wheat leaves at least a part of the C6-compound formed by the carboxylation of ribulose 1,5-diphosphate is directly converted to sugar phosphate.

1Part of this investigation was reported at the 2nd International Congress on Photosynthesis Research at Stresa, Italy, June 1971. This paper is based on a dissertation submitted by S.S. to the Faculty of Science, the University of Tokyo, in partial fulfilment of the requirements for a Ph.D. degree.

2Present address: Department of Botany, Faculty of Science, University of Tokyo, Tokyo, Japan.

(Received July 20, 1973; )
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